Poptops are a unique monster type, found generally in tranquil environments. They wander around aimlessly whistling to themselves, but when the player draws near they get aggressive, attacking with leaping bites.

This monster does not possess a weakness (+50% damage taken) or a resistance (-50% damage taken) to any type of damage.

Mines each have a large room within them patrolled by multiple Poptops accompanied by an incredibly strong Mother Poptop.
On occasion, Poptops on Jungle Planets will be accompanied by an Adult Poptop, which is not quite as strong as a Mother Poptop but is still a considerable threat.

Despite their viciousness, Poptops are considered adorable enough to have a plush toy based on them.